9e225de2

test: the convergence, and the legs it deliberately changed

a73x   2026-08-20 07:53

test: the convergence, and the legs it deliberately changed

Three new scenarios (52 -> 55), each pinning something only a converged
mux can do:

  * `mux TARGET` IS a wall: `Ctrl-\ w` unzooms onto the SAVED tiles (a
    tile an earlier `mux` wrote, in a process never told about it), Enter
    returns for a flat attach count, and `q` leaves mux.
  * the ring GROWS the wall: `Ctrl-\ n` onto a sibling with no tile dials
    once and writes its line; `Ctrl-\ n` back onto one that has a tile
    costs nothing. Same chord, twice, and the counter is the difference.
  * a session that ends under the zoom: alone it exits mux with the
    shell's own code, in company it drops to the wall with the dead tile
    narrating `[exited]` beside the live one.

Four existing legs evolved, and every edit is a behaviour this phase
changed on purpose:

  * M2 (`Ctrl-\ c`) and M3 (the ring) waited on a fresh `?1049h` per
    switch, because each switch WAS a fresh client process on a fresh
    terminal. The alternate screen is now entered once and never left, so
    the arrival signal is `setZoom`'s own screen clear. Waiting matters
    rather than being decoration: keystrokes sent before the handover go
    to the mailbox of the tile being left. M2's refused fourth chord waits
    on session 3's marker instead, because a `[2J` cannot tell "arrived"
    from "came straight back".
  * M4 (`Ctrl-\ w`) loses the child wall it was written for. `w` demotes
    in place, the return is Enter (`q` now LEAVES mux, which is the
    spec's model), and the leg gains a state home of its own because the
    wall an unzoom shows is the saved one — the shared XDG_STATE_HOME is
    every socket the suite ever attached to. Its passivity assertion is
    re-aimed rather than dropped: "the wall's separate 0x0 attach did not
    move the grid" becomes "unzooming gave nothing back", since there is
    no separate attach left to say it about. It also now reads the wall
    file back, which is where a chord-added tile earns its record.
  * the in-place-zoom leg unzoomed with `d`. That was the child-spawn
    era's second spelling of "come back"; `d` now means what a user's
    fingers mean by it, so the leg uses `w`.

Nothing else moved. Every other scenario — attach, detach, exit codes,
prediction, wheel, scrollback, OSC 133, bracketed paste, self-attach
refusal, attach history, reconnect — is byte-identical and green.